Sending arrangement



June 17 1924. 1,497,927

, A. MElSSNER SENDING ARRANGEMENT 'Filed Sent. 1921 avwmvlw FLEXHNDER l lE/SSNER 8&1 his Patented June 17, 1924.

UNITED STATES PATENT ()FFICE.

ALEXANDER IHEISSNER, OLE BERLIN, GERMANY, ASSIG-NOR TO GESELLSGHAFTJFIIR DRAI-ITLOSE TELEGRAPHIE M. B. H. I-IALLESGHES, OF BERLIN, GERMANY, A GOR- PORATION OF GERMANY.

SENDING ARRANGEMENT.

Application filed September 3, 1921. Seria1 No. 498,420.

(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH 3, 1921, 41 STAT. L, 1818.)

To all whom it concern:

Be it known that I, ALEXANDER MEISSNER, citizen of the German Republic, residing at Berlin, Germany, have invented certain new 5 and useful Improvements in Sending Arrangements (for which I have filed applications as follows: Germany, Pat. No. 333,297, filed Oct. 24, 1918; Argentina, register No. 21 333/236, filed July 20, 1920;

Brazil,'register No. 172 38, filed July 10, 1920; Chile, filed Sept. 23, 1920; Denmark, register No. 3423/19 filed Dec. 18, 1919; Netherlands, register No. 14287, filed March 13, 1920; Japan, register No. 58307, filed July 1, 1920; Norway, register No. 18896/19,

filed Dec. 31, 1919; Austria, register No. A 3870/19, filed Dec. 23, 1919} Peru, filed Oct. 29, 1920; Sweden, register No. 50290 /19, filed Nov. 25, 1919; Spain, Patent No. 72,216; 20 Czechoslovakia, register No. 4766/20, filed June 25, 1920), of which the following is a specification. The invention relates to sender arrangements for high frequency oscillations as used in wireless telegraphy, and its main object is to radiate from the antenna the ground wave and to prevent the entrance of the over-waves into the antenna. In accordance with the present invention, a shortcircuit tuned to the over-waves is connected in parallel with the high frequency generator or with the transformer associated with the high frequency generator. Such shortoircuit presents an infinite resistance against the ground waves, but short circuits the over-waves.

The drawing shows an exemplification of the arrangement.

T is a secondary winding of the transformer connected with the high frequency generator. If a cathode tube is used for generating oscillations, instead of the transformer, the tube with its coupling element may be connected in the circuit. The secondary Winding of the transformer is grounded at B, and is connected at A with antenna S. In accordance with the inven tion, a short circuit K is provided ahead of the antenna loading inductance L, and comprises a-n inductance J and a capacity C. By means of th two values, the short circuit K is tuned to the over-wave and serves, therefore as a shunt oath for the over-waves but presents an in nitely high resistance against the ground waves.

I claim:

1. A sending arrangement for wireless telegraphy and telephony comprising a grounded antenna and means for preventing radiation from the antenna of harmonics of th fundamental frequency of the arrangement, said means comprising a grounded circuit arranged in parallel with the grounded portion of the antenna and tuned to the harmonics.

2. A sending arrangement for Wireless telegraphy and telephony comprising a grounded antenna, and means for preventing radiation from the antenna of a harmonic of the fundamental frequency of the arrangement, said means comprising a grounded circuit arranged in parallel with the grounded portion of the antenna, and said circuit including an inductance and capacity in series and being tuned to the harmonic so as to constitute therefor a shortcircuit to ground.

3. A sending arrangement for wireless telegraphy and telephony comprising an antenna, a loading inductance in the antenna, and means for preventing radiation from the antenna of a harmonic of the fundamental frequency of the arrangement, said means comprising a grounded circuit connected to the antenna between the loading inductance and ground in parallel with the groundedportion of the antenna and tuned to the harmonic.

In testimony whereof I afiix the signature.

ALEXANDER MEISSN ER. 

